package com.lau.config;

import com.lau.security.*;
import com.lau.utils.JwtUtils;
import com.lau.utils.RedisUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {


    @Autowired
    JwtAuthenticationEntryPoint jwtAuthenticationEntryPoint;

    @Autowired
    JwtAccessDeniedHandler jwtAccessDeniedHandler;

    @Autowired
    UserDetailServiceImpl userDetailService;

    @Autowired
    JwtLogoutSuccessHandler jwtLogoutSuccessHandler;

    @Autowired
    JwtUtils jwtUtils;

    @Autowired
    RedisUtil redisUtil;


    /**
     * 解决 无法直接注入 AuthenticationManager
     */
    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }


    /**
     * 密码加密的方式
     */
    @Bean
    BCryptPasswordEncoder bCryptPasswordEncoder() {
        return new BCryptPasswordEncoder();
    }

    /**
     * 设置访问白名单
     */
    private static final String[] URL_WHITELIST = {
            "/login",
            "/logout",
            "/captcha",
            "/favicon.ico",
            "/druid/**"
    };

    /**
     * anyRequest          |   匹配所有请求路径
     * access              |   SpringEl表达式结果为true时可以访问
     * anonymous           |   匿名可以访问
     * denyAll             |   用户不能访问
     * fullyAuthenticated  |   用户完全认证可以访问（非remember-me下自动登录）
     * hasAnyAuthority     |   如果有参数，参数表示权限，则其中任何一个权限可以访问
     * hasAnyRole          |   如果有参数，参数表示角色，则其中任何一个角色可以访问
     * hasAuthority        |   如果有参数，参数表示权限，则其权限可以访问
     * hasIpAddress        |   如果有参数，参数表示IP地址，如果用户IP和参数匹配，则可以访问
     * hasRole             |   如果有参数，参数表示角色，则其角色可以访问
     * permitAll           |   用户可以任意访问
     * rememberMe          |   允许通过remember-me登录的用户访问
     * authenticated       |   用户登录后可访问
     */
    protected void configure(HttpSecurity http) throws Exception {

        http.cors().and()
                // CSRF禁用，因为不使用session
                .csrf().disable()

                .logout()
                .logoutSuccessHandler(jwtLogoutSuccessHandler)

                // 禁用session
                .and()
                .sessionManagement()
                .sessionCreationPolicy(SessionCreationPolicy.STATELESS)

                // 配置拦截规则
                .and()
                .authorizeRequests()
                .antMatchers(URL_WHITELIST).permitAll()
                .anyRequest().authenticated()

                // 异常处理器
                .and()
                .exceptionHandling()
                .authenticationEntryPoint(jwtAuthenticationEntryPoint)
                .accessDeniedHandler(jwtAccessDeniedHandler)
                // 配置自定义的过滤器
                .and()
                .addFilter(new JwtAuthenticationFilter(super.authenticationManagerBean(),jwtUtils,redisUtil))
        ;
    }

    /**
     * 此处配置的url不会走过滤器
     * 即使url里面带了token也不会做权限校验
     */
    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers(URL_WHITELIST);
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailService);
    }
}
